NCBC-334: (amendment) Add a method of getting the version of the library programatically

This commit amends the previous NCBC-334 by removing the Version.txt file and setting the default
values for the AssemblyVersion, AssemblyFileVersion and AssemblyInformationalVersion attributes

Change-Id: I7949204c0cc7f674338564d0d39067520c10fcc9
Reviewed-on: http://review.couchbase.org/31698
Tested-by: Jeffry Morris <jeffrymorris@gmail.com>
Reviewed-by: Brett Lawson <brett19@gmail.com>